10001021221 has 8 divisors (see below), whose sum is σ = 10034275680. Its totient is φ = 9967818288.

The previous prime is 10001021209. The next prime is 10001021231. The reversal of 10001021221 is 12212010001.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10001021221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10001021198 and 10001021207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10001021231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 397350 + ... + 421768.

It is an arithmetic number, because the mean of its divisors is an integer number (1254284460).

Almost surely, 2^10001021221 is an apocalyptic number.

It is an amenable number.

10001021221 is a deficient number, since it is larger than the sum of its proper divisors (33254459).

10001021221 is an equidigital number, since it uses as much as digits as its factorization.

10001021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25763.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 10001021221 its reverse (12212010001), we get a palindrome (22213031222).

The spelling of 10001021221 in words is "ten billion, one million, twenty-one thousand, two hundred twenty-one".